How do you calculate pressure drop in a heat exchanger?
Total volumetric flow = 50000 kg/hr ÷ 988.0 kg/m3 = 50.61 m3/hr Volumetric flow in each 1″ tube = 50.61 ÷ 25 = 2.02 m3/hr Pressure loss per unit length of the tube is then calculated using EnggCyclopedia’s pressure drop calculators for pipes and tubes.
What is allowable pressure drop in heat exchanger?
If it is possible to increase the allowable pressure drop, and inci- dentally accept higher pumping costs, then the heat exchanger will be smaller and less expensive. As a guide, allow- able pressure drops between 20 and 100 kPa are accepted as normal for water/water duties.
How do you calculate pressure drop in a double pipe heat exchanger?
Background on Pressure Drop Calculation for Pipe Flow
- hL = frictional head loss, ft-lb/lb.
- L = pipe length, ft.
- D = pipe diameter, ft.
- V = average flow velocity of fluid (= Q/A), ft/sec.
- g = acceleration due to gravity = 32.2 ft/sec2.
How do you calculate allowable pressure drops?
The pressure drop calculation becomes: Pressure drop = (615.6 ml/min x 10 min x 14.5 psi) / (53,000 ml) = 1.68 psi. The maximum allowable pressure drop for this system during a 10 minute pressure hold integrity test is 1.68 psi.
How do you reduce pressure in a heat exchanger?
Tube side pressure drop can be lowered in the following ways: Increasing the shell diameter. Increasing the shell diameter increases the tube flow area due to the increased number of tubes and, thereby, reduces tube flow velocity and, hence, reduces tube side pressure drop.
How many times do we have to calculate pressure drop in a shell and tube heat exchanger?
4. How many times do we have to calculate for Pressure drop in a Shell and Tube Heat Exchanger? Explanation: For a Shell and Tube HE, we have to calculate pressure drop twice, once for the tube to check whether the equipment can handle that pressure. Similarly, the second time for the shell side.
How do you calculate overall heat transfer coefficient in heat exchanger?
The overall heat transfer coefficient R = Resistance(s) to heat flow in pipe wall (K/W) Other parameters are as above. The heat transfer coefficient is the heat transferred per unit area per kelvin. Thus area is included in the equation as it represents the area over which the transfer of heat takes place.